Structures of nuclei of three atoms A ,B...

Structures of nuclei of three atoms A ,B and C are given belo A has 90 protons and 146 neutrons , B has 92 protons and 146 neutrons , C has 90 protons and 148 neutrons . Based on the above data,which of these atoms are isotopes and which are isobars?
(1) A and B are isotopes; A and C are isobars
(2) A and C are isotopes; B and C are isobars
(3) A and C are isotopes; A and B are isobars
(4) B and C are isobars; A and B are isotopes.

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